Gun-barrel.



T. C. JOHNSON.

GUN BARREL.

APPLICATION FILED 11:12.2,1914.

Patented July 7,191;

UNITED STATES PATENT oFiuoE.

THOMAS C. JOHNSON, OF NEW HAVEN, CONNECTICUT, ASSIGNOR TO WINCHESTER REPEATING ARMS 00., OF NEW HAVEN, CONNECTICUT, A CORPORATION.

Gun-BARREL.

Specification. of Letters Patent.

Patented July 7, 1914.

To all whom it may concern.-

Be it known that I, THOMAS C. JoHNsoN, a citizen of the United States, residing at New Haven, in the county of New Haven; and State of Connecticut, have invented a new and useful Improvement in Gun-Barrels; and I do hereby declare the following, when taken in connection with the accompanying drawings and the characters of reference marked thereon, to be a full, clear, and exact description of the same, and which said drawings constitute part of this application, and represent, in-- Figure 1 a plan view of a gun-barrel constructed in accordance with my invention. Fig. 2 a View thereof in side elevation. Fig. 3 a broken plan view of the muzzle-end of the barrel, drawn to the full scale and showing by a broken circular line how the stock of the sighting-rib may be removed to produce the struts which support it throughout its length. Fig. a corresponding view in side elevation. Fig. 5 a view in transverse section on the line ab of Fig. at.

My invention relates to an improvement in that class of gun barrels provided with ventilated sighting-ribs, the object being to produce a gun barrel of the character described of superior strength, mechanical strui'rture and appearance.

\Vith these ends in view, my invention consists in a gun-barrel having an integral ventilated sighting-rib supported by a continuous series of struts arranged in alineincnt under the axial center of the rib.

In carrying out my invention as herein shown. 1' form upon the top of the barrel 2, a sigbtingaih 3 made integral therewith. 'lhis rib is ventilated to prevent the distortion of the barrel due to the repeated shooting of the gun in rapid succession, by means of wide. regularly spaced transverse ventilating-openings -t uniform in shape and size and formed in the base of the rib below its upper surface which is continuous. The

produrtirm of the said transverse openings -lresults in the formation of a series of regularly spaced, squat struts 5 also uniform in shape and size and axially arrangedin strict alinement with the central longitudinal axis 0f the rib. In default of a better term,

these struts may be characterized as diamond shaped. The said struts 5 may, and preferably will be, produced by means of a circular cutter represented in Fig. 3 of the drawings by means of a broken semicircle (3, this cutter being applied to the opposite sides of the initially solid rib which it penetrates, the cutter'extending past the center thereof, whereby the said openings 4 and the said struts 5 are produced and the latter given their diamond shape with slightly concaved faces. As all of the struts 5 are arranged in exact alinement, the effect is not only symmetrical-and mechanically correct, but also of superior functional result, inasmuch as the rib is uniformly sup ported throughout its length against all downward or lateral blows, whereby the likelihood of its being distorted or displaced is reduced to the minimum. Furthermore, the symmetrical arrangement of the struts 5,

and hence their even distribution considered .series of diamond-shaped struts the long axes of which are coincident with the central longitudinal axis of the rib.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

THOMAS C. JOHNSON. \Vitnesses:

FRANK A. PAUL, DANiEI. H. VEADER. 

